A043051 a(n)=(s(n)+3)/5, where s(n)=n-th base 5 palindrome that starts with 2.

1, 3, 11, 12, 13, 14, 15, 51, 57, 63, 69, 75, 251, 256, 261, 266, 271, 277, 282, 287, 292, 297, 303, 308, 313, 318, 323, 329, 334, 339, 344, 349, 355, 360, 365, 370, 375, 1251, 1281, 1311, 1341, 1371, 1377, 1407, 1437, 1467, 1497

Offset

1,2

Links

Table of n, a(n) for n=1..47.

Mathematica

pal5Q[n_]:=Module[{idn5=IntegerDigits[n, 5]}, idn5==Reverse[idn5]&&First[idn5]==2]
(#+3)/5&/@Select[Range[9000], pal5Q]  (* Harvey P. Dale, Feb 13 2011 *)

Crossrefs

Sequence in context: A072980 A128500 A365037 * A024545 A101134 A045110

Adjacent sequences: A043048 A043049 A043050 * A043052 A043053 A043054

Keyword

nonn,base

Author

Clark Kimberling

Status

approved